LA Tri Series

The World's Longest Running Triathlon Series. Since 1983

Enjoy an easy going atmosphere, with plenty of top notch competitions

42 Years and Counting!

Home of the LA Championship and the Tri Express Triathlon Series

An event for everyone, from beginners to experienced!

TRIATHLON | AQUABIKE | DUATHLON

Spectrum Sports is proud to announce that the world's oldest running tri series, the LA Tri Series, will continue for its 43rd year in October 2025!

This year, we'll be racing on Saturday, October 4th, at the long-standing home of the LA Tri, Bonelli Park. In its 43rd year, the LA Tri Series will feature a singular event weekend as we work to revamp the LA Tri into a full-fledged Triathlon Festival. Event day will include races at the Super Sprint and Championship distances, along with the second year of the Iron Bruin Collegiate Distance—a competition open to all current and aspiring collegiate triathletes and alumni. Registration will begin on May 8th with special early-bird pricing. Whether it's your first tri, you're in the middle of a training cycle, or you just want to get out there and go fast, come join us for the 43rd annual LA Triathlon on October 4th at Bonelli Park!!

Welcome to the oldest, continuous running triathlon in the world.

Since 1983 triathletes have traveled to Bonelli Park, on the eastern edge of Los Angeles County, to learn the sport; to shake off the winter rust and get ready for the upcoming season; to see old friends and make new friends; and to be in the midst of a fun, high-energy, multi-sport setting. The LA Tri-Series events accomplish all of that and more! If you are new to the sport of triathlon this is the perfect setting to learn open water swimming in a safe environment, cycling around as a safe course with little traffic, and a well-supported run to one of the most beautiful finish lines you will experience. If you are an experienced triathlete who has been waiting for a warm water swim and safe bike course to start off the season – this is for you also.

Come on out and be a part of history at the 42nd consecutive LA Tri-Series event.

Calm lake swim, scenic run with paved roads, great family friendly atmosphere for participants and spectators

Be a part of the best California Triathlons & Multi-sport events!

World Class Events

We pride ourselves on ‘athlete first’ management with an eye towards a Best In Class experience for the athlete, whether a beginner or an experienced triathlete – you are our priority. We are honored to have many of the most recognized elite athletes in the sport call both “Bonelli” and the “LA Series” a regular stop in the annual triathlon circuit and in many cases where they got their triathlon start.

An Amazing Venue

Bonelli Park is the perfect venue for the ultimate triathlon training. The lake in the middle of LA is easily accessible, calm and well supported with lifeguards; the bike course has rolling hills and no left turns to navigate against traffic; the run is near the lake on trails and paths that are easy to navigate until you reach the finish in a beautiful picnic setting.

Fun for Everyone

Our event has a super relaxed setting were spectators can mingle with the athletes afterwards and watch the run and bike course — all from really close to the finish line. We also get some of the biggest names in the sport competing in every event. It’s the perfect mix.

Spectrum Sports is proud to announce that the world's oldest running tri series, the LA Tri Series, will continue for its 43rd year in October 2025!

Welcome to the oldest, continuous running triathlon in the world.

Calm lake swim, scenic run with paved roads, great family friendly atmosphere for participants and spectators

USAT Sanctioned Event

Clubs and Teams